Concrete joint



March 11, 1930. J HELTZEL 1,750,105

CONCRETE JOINT Filed Nov. 19, 1926 Patented Mar. 1 1, 1930 UNITEDSTATES,

JOHN N. ,HELTZEL, or WARREN, onro CONCRETE JOINT Application filedNovember 19, 1926. Serial No. 149,443.,

The present invention relates to concrete joints, suchas intended forconcrete roads and other surfacing structures, and it is the object ofthis invention to provide novel and 5 improved means for controlling thebreaks and defining the joints of the road for other cementitiousstructure, this invention being an improvement over the oints disclosedin mycopending application Serial No. 3,972, filed January 22, 1925.--

A further object is to combine in a'sim-ple and effective manner thejoint defining means with reinforcing rods or other reinforcementembedded in the concrete.

With the foregoing and other objects in view, which will be apparent asthe description proceeds, the invention resides in the construction andarrangement-0f parts, as,

hereinafter described and claimed, it being understood that changes canbe made within the scope of what is claimed, without departing from thespirit of the invention.

The invention is illustrated in the accompanying drawings, wherein-'Figure 1 is a perspective view of a concrete road constructed inaccordance with the present invention, portions being broken away toillustrate the details more clearly.

Fig.2 is a fragmentary perspective view illustrating a modification.

Figs. 3 and 4 are fragmentary perspective views illustrating othermodifications,

Fig.5 is a cross section of the longitudinal joint strip as shown inFig. 4. Fig. 6 IS a fragmentary perspective view illustrating anothervariation in the form of joint stri s. I v Fig. 1 illustrates the sideform rails 10 between which the grout or ag regate is poured and whichdefine the side e ges of the road under construction. Reinforcement isdis- ,posed between the rails or forms 10 above the sub-base to beembedded in the concrete, and [as shown in Fig. 1, such reinforcement isof mesh form, comprising the longitudinal rods 11 and transverse rods 12interwoven. .The longitudinal rods 12 are interrupted or spaced apartalong the lines of the transverse joints, to ermit of expansion andcontraction of the sla s or sections of concrete.

In carrying out the invention the transverse reinforcing rods 12, or atleast some of them, terminate adjacent to the longitudi-. nal center orjoint line of the road and are bent upwardly, as at 13, so as to receivebetween them longitudinal strips 14 or other suitable joint-definingmembers, in order to support said strips or members in place on thereinforcement during the pouring and finishing of the aggregate, thereinforcement and strips 14 being embedded in the cementitious material.Transverse joint defining strips or members 15 may be similarly embeddedin the material to define the transverse joints or breaks of theconcrete, and the strips 14 and 15 may be withdrawn from the concretebefore it has hardened, so as to leave grooves in the surface ofconcrete to be filled with; tar, macadam, or other sealing material. Thestrips 14 and 15 divide the concrete intothe slabs 16, and by combiningthe joint defining or producing means with the reinforcement this willprovide for economical and eflicient roadconstruction.

\Fig. 2 illustrates how the joint strips may be eliminated by employingthe upstanding inner terminals 13 of the transverse rein.- forcing rods12 to define or form the longitudinal break or joint, said terminals 13"extending along the line of the break or joint so desired so as toproduce a weakened plane or line along the concrete, so that theconcrete, when hardened, will break along said line rather than along anirregular line as when a natural break occurs. -The longitudinalreinforcing rods 11 may have similar upturned terminals for defining thetransverse breaks.

Fig. 3 illustrates a sheet 11 of expanded metal embedded in each slab orsection 16 of the concrete, and said sheets provide the re inforcement."The sheets have the u standing flanges or strips 14 and 15 we ded orotherwise secured thereto to define the longitudinal and transversejoints.

Fig. 4 illustrates the longitudinal and transverse strips 14 and 15 ashaving lu s 13" at their lower edges pressed alternate y towardfoppositesides, and the lugs have apertures 17 through which the reinforcing rodslot 11 and 12 extend, in order to support the strips in place. The lugs13 being offset toward opposite sides Will brace the strips and maintainthem in upright edgewise position. Fig. 6 illustrates a modified form oflongitudinal strip 14 which has at its lower edge the lu s or portions13 bent toward opposite si es and provided with depending terminalshaving the apertures 17 to en age the reinforcing rods, said apertureshaving slits or slots extending to the lower edges of the portions 13 inorder that said ortions 13 may be sprung over the rods wit out having toinsert the rods endwise through the apertures. The strip 14: is alsoshown as having longitudinal corrugations 18 so that the slabs orsections of concrete will have interengaging tongues and grooves alongtheir adjacent edges to provide interlocking hinge joints to permit offlexing action.

The strips, such as shown in Figs. 1, 3, A; and 6, may be welded to thereinforcing rods.

Having thus described the invention, what isrclaimed as new is i 1. Aconcrete surfacing structure having reinforcement embedded therein, anda joint defining strip extending over said reinforcement, thereinforcement including rods having upwardly bent terminal portions tohold the strip in place. l

2. A concrete surfacing structure having reinforcement embedded therein,and a joint defining strip extending over said reinforcement, thereinforcement including rods ex tending under said strip and havingupwardly bent terminal portions at opposite sides of said strip.

3. A concrete surfacing structure reinforcement, and a joint definingstrip extending thereover, said reinforcement including -rods havingupturned terminals holding said strip in place.

4. A concrete surfacing structure reinforcement, and a joint definingstrip extending thereover, said reinforcement including ro s extendingunder said strip and having upturned terminals at opposite sides of thestrip.

therein, said reinforcement includin 'rods extending under said jointmeans and aving upwardly extending terminal portions engaging said jointmeans.

.6. A concrete surfacing structure reinforcement and joint meansthereon, said reinforcement havin rods extending under said means andprovi ed with upturned terminals at opposite sides of said means forholding same in place.

In testimony whereof I hereunto aflix my signature.

JOHN N. HELTZEL.

5. A concrete surfacing structure having I joint means and reinforcementembedded

